is a page on the dual accelerator pump Q-jet. There, you will be able to see what a full-on feedback Q-jet looks like and can compare that to what you have.
If you have a feedback carb but no computer controlling it, it will run excessively rich and will be a slug for the most part, although WOT shouldn't be that bad- but you cannot drive everywhere wide open, at least not for long. You cannot judge the secondary operation by revving the engine in the driveway, either. I'm not suggesting you take it out anf run WFO, either. Just saying.
The '89 Caprice w/a 305/350 SBC used TBI- the computer will be different, as will the connections, etc. The only carbed engine was the 307 Olds.
If you do not have emissions testing, I would use a non feedback Q-jet carb (a non feedback dual capacity accelerator pump Q-jet would be fine), along w/a HEI distributor